Sharp PC-7200 Service Manual page 59

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P C-7200
Pin Description
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""""I'1N
0,
Fcrm:ti
No,
*1
I MAClK
0 l
Clock output from the memory addressing
counter
2 DINH I l LCD Data control input
D1NH
is
HIGH: Data (UDO-UD3.LDO-LD3) are
LOW.
3 HPlMTI I
l Input signals to determine the number of horizontal dots of HPlMlI l l H
H
4 HPlMTO
a character HPlMTO
l H l H
HORIZONTAL
8 4 6 8
DOTS
5 RD7 I l Input data to display in the lCD mode
I I
12 RDO
13 All I l
Input signals to control the attributes
14 ATO
ATI l l H
H
ATO l H
l
H
ATTRIBUTE EXTINGUISH REVERSAL NORMAL LIGHT
15 VSS System ground
16 DISPTMG
a
C/l Output signal to indicate the active display arealt is an active high signal.
17
CUDISP 0 C Output signal to indicate a valid cursor address in '!he CRT mode. It is an active high signal. In the LCDmode, this
output is not effective - kept LOW,
18 EXTCU I C/l Input signal to enable the external cursor control.
It is an active high signal.
EXTCU is LOW
: Extinguish
EXTCU is HIGH: The cursor position is determined by the value of the Cursor Scan line Register.
19 HSYNC
0 C/l Output signal which is active during the horizontal retrace interval
20 EXSYNC
J
C/l Input signal to enable the external sync mode.
It is an active high signal.
ESYNC is High: External Sync Mode
21 VSYNC
I/O
C/l
Bi-directional signal which is active during the vertical retrace interval.
EXSYNC is lOW : (VSYNC) output
EXSYNC is HIGH: (VSYNC) input
22 MAO 0 C/l
Output signal to provide refresh memory addresses.
I I
35 MAI3
36
FlOA I C/l
Input signal to float MAO MAI3 and RAO
RA4 outputs.
It is an active low signal.
37 RES I C/l Input signal to reset this LSI. It is an active low signal.
38
lPSTB I C
Input signal from the light pen detecting a character position
39 DUTY I
l Input signal to determine the duty of the LCD.
High: 1/100,
Low: 1/200
40 CRT /lCD
I
Input signal to select the display device, the CRT or the LCD. High: CRT mode, Low: LCD mode
41 VPlMT I l Input signal to limit the number of vertical dots of a character.
42 2BYTE I l Input signal to enable horizontal 16 - dot characters.
2BYTE is LOW
: Horizontal 8 - dot character
2BYTE is HIGH: Horizontal 16-dot character
43 IS/2S l Input signal to select the LCD format, the non divided display format or the divided display format
IS/2S is HIGH: non-divided display format
IS/1S is lOW : divided display format
44 ClK I C Clock input in the CRT mode. It is used to synchronize all CRT functions.
45
BLANK I l Input signal to generate HSYNC and VSYNC in the LCD mode.
BLANK is HIGH: Generation of HSYNC and VSYNC
BLANK is LOW : Non-genertion of HSYNC and VSYNC
46 RAO
0
C/l Output signals provide the row address of a character.
I I
50
RA4
51 RS
J
C/l
Input signal to select the internal registers
RS is LOW : Selection of the address registers
RS is HIGH: Selection of the control registers
52 CS I C/l
Chip select signal input. It is an active low signal.
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